Scott is back with questions about how 4K will affect 3D and what glasses would be best. Sony uses both, but Samsung and LG both use passive technology. Vizio went with the passive glasses in 2013, but this year they dumped 3D altogether. Scott says he likes passive glasses because they're lighter and the TVs are more affordable. Passive is brighter, but even then it only lets in 50% of the light. Active glasses lets in only 30% of the light, and you have to recharge them or change the batteries. Scott also says the one good thing is that 4K offers 1080p in each eye for 3D.